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A kind of formation method for high energy density lithium-ion battery

A lithium-ion battery, high energy density technology, applied in the field of lithium batteries, can solve the problems of inapplicable lithium-rich-carbon negative electrode high energy density battery, poor rate performance, and high charging voltage, so as to reduce initial capacity loss and reduce flatulence , to avoid worsening effects

Active Publication Date: 2016-08-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The matching of lithium-rich cathode materials and carbon-based anodes can produce batteries with high energy density, and the energy density can reach more than 240Wh / kg. However, due to the characteristics of high charging voltage and poor rate performance of lithium-rich materials, the currently commonly used formation methods are not High energy density batteries suitable for lithium-carbon anodes

Method used

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  • A kind of formation method for high energy density lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First make the battery:

[0031] Weigh the material according to the mass ratio of lithium-rich cathode material: PVDF (polyvinylidene fluoride): Super P (conductive carbon black): KS-6 (flake graphite conductive agent) = 94: 2.5: 3: 0.5, and dry Remove moisture. Dissolve PVDF into NMP (N-methylpyrrolidone) to make PVDF glue, add Super P and KS-6 to it and stir to make conductive agent glue, then add lithium-rich positive electrode material to it, stir evenly, and then According to 110g / m 2 The density on one side of the aluminum foil is uniformly coated on both sides of the aluminum foil, dried at 100°C for 10 hours, then rolled, cut into positive electrode sheets, and positive electrode tabs are spot welded.

[0032] Weigh the material according to the mass ratio of graphite: Super P (conductive carbon black): SBR (styrene-butadiene rubber): CMC (sodium carboxymethyl cellulose) = 93.2: 2.5: 2.5: 1.8, wherein SBR is in the state of emulsion, and other materials Bake...

Embodiment 2

[0049] Weigh the material according to the mass ratio of lithium-rich cathode material: PVDF (polyvinylidene fluoride): Super P (conductive carbon black): KS-6 (flake graphite conductive agent) = 94: 2.5: 3: 0.5, and dry Remove moisture. Dissolve PVDF into NMP (N-methylpyrrolidone) to make PVDF glue, add Super P and KS-6 to it and stir to make conductive agent glue, then add lithium-rich positive electrode material to it, stir evenly, and then According to 120g / m2 The density on one side of the aluminum foil is uniformly coated on both sides of the aluminum foil, dried at 100°C for 10 hours, then rolled, cut into positive electrode sheets, and positive electrode tabs are spot welded.

[0050] Weigh the material according to the mass ratio of silicon carbon negative electrode material: PVDF (polyvinylidene fluoride): Super P (conductive carbon black) = 94.5: 5: 0.5, and dry to remove water. Dissolve PVDF into NMP (N-methylpyrrolidone) to make PVDF glue, add Super P to it and s...

Embodiment 3

[0088] The manufacturing process of the positive and negative electrodes is exactly the same as that of Example 1, except that the active material of the negative electrode is changed to MCMB (mesophase carbon microspheres). Wind the positive electrode sheet, diaphragm, and negative electrode sheet into a square core, put them into a square aluminum shell, bake at 85°C for 24 hours, and inject a 4.5V high-voltage resistant electrolyte.

[0089] Formation of battery:

[0090] (1) After the battery injection is completed, add sealing cotton to the liquid injection hole, and fix the sealing cotton with transparent tape, and let it stand for 30 hours;

[0091] (2) Charge to 4.0V at a rate of 0.01C,

[0092] (3) Charge to 4.2V at a rate of 0.03C;

[0093] (4) Charge to 4.4V at a rate of 0.1C;

[0094] (5) 4.4V constant voltage charging for 2h;

[0095] (6) Aging the battery at 80°C for 1 hour. After aging, place the battery in a vacuum box to evacuate the air, then weigh the ba...

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Abstract

A high-energy density lithium ion battery formation method includes the following steps: S1, after battery filling, the filling hole is sealed with sealing cotton, and standing lasts for 16-48h; S2, a battery is charged to 3.7 to 4.0V by a multiplying power of 0.01 to 0.02C; S3, the battery is charged to 4.0-4.35V by a multiplying power of 0.03 to 0.05C; S4, the battery is charged to 4.35 to 4.5V by a multiplying power of 0.1 to 0.2C, and then the battery is charged for 1 to 3h at a constant voltage of 4.35 to 4.5V; S5, the battery is subjected to high temperature aging and then is subjected to exhaust-gas disposal, and then secondary filling is performed according to the weight change of the battery to supplement electrolyte lost during formation and aging; S6, the battery is sealed. The high-energy density lithium ion battery formation method improves the first efficiency, safety performance and cycle performance of a rich lithium anode-carbon cathode system battery, avoids the flatulence problem during formation, and reduces the internal resistance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a formation method of a lithium-ion battery with high energy density used in a lithium-rich positive electrode-carbon negative electrode system. Background technique [0002] Lithium-rich cathode material xLi 2 MnO 3 (1-x)LiMO 2 by Li 2 MnO 3 and LiMO 2 The formed solid solution material, wherein M is one or more of Ni, Co, Mn, Ti, Cr, Al, Fe, Mg, has α-NaFeO 2 Layered structure, belonging to hexagonal crystal system, R-3m space group, Li occupies 3a position, transition metal occupies 3b position, Li 2 MnO 3 The transition metal layers are alternately arranged by Li and Mn atoms in a ratio of 1:2. When the charging voltage is not higher than 4.5V, only the lithium in the lithium layer in the material is released, and the transition metal undergoes a redox reaction, and the Li 2 MnO 3 It will not change. When the charging voltage is higher than 4.5V, the lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/0525H01M10/058H01M10/44Y02E60/10
Inventor 邢军龙杨续来王启岁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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